Improving performance of organic solar cells using amorphous tungsten oxides as an interfacial buffer layer on transparent anodes
✍ Scribed by Seungchan Han; Won Suk Shin; Myungsoo Seo; Dipti Gupta; Sang-Jin Moon; Seunghyup Yoo
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 805 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1566-1199
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✦ Synopsis
Thermally evaporated tungsten oxide (WO 3 ) films are investigated as a buffer layer on anodes to improve the performance of bulk-heterojunction solar cells based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C 61 butyric acid methyl ester (PCBM-60). Characterization of the WO 3 film under study shows that it is amorphous with the conductivity on the order of 10 À6 S/cm and can effectively planarize an originally rough ITO surface down to the RMS roughness of 0.88 nm. Insertion of 5-30 nm-thick WO 3 layers resulted in power conversion efficiency and fill factor as high as 3.1% and 0.70, respectively, showing an improvement with a good batch-to-batch consistency over conventional cells. The observed improvement is related mainly to the relatively large shunt resistance of WO 3based cells under illumination that is linked to a low carrier recombination resulting in high fill factor and open-circuit voltage.